Wearless geared pump



May 7, 1.929. 5. MORlTA 1,712,157

WEARLES S GEARED -PUMP Filed Jan. 1G, 1926 ya@ merda v fluor/vlug Patented May 7, 1929;.

, SHOSAKU MORITA, 0F AZA,

HQDOGAYA-MACHI, JAPAN.

o wEARLEss GARED PUMP.

This invention relates to an improvement' in a rotary pump of geared type and has for its'objcct an improved@ geared pump in which a slider' arranged in each of the teeth of the .rotor is always tightly pressed to the surfaces of the drum and the end cover of the pump by a combined action of centrifugal foree'and spring so that any constructional errors or inaccuracy of the sliding parts of the pump or any wear of the same which may occur in the run of the working of the pump, is entirely and automatically diminished and a perfect fitting vof the sliding parts is obtained to give the result of the greatest efficiency of `the pump.

The invention may be more fully described referring to the accompanying drawings in which:

Fig. 1 is a section along a plane parallelv to the axle of the rotating shaft,

Fig. 2 is a section along a plane at right angle to the axle of the rotating shaft, andy Fig. 3 is an elevation of a slider employe in this invention.

In the drawings 1 is the casing of a pump; 2 and 2 are the end covers or casing walls of both sides of the casing; 3 and .3 the rotors; 4 the teeth of the rotors; 5 the rotating shaft; 6 the suction and 7 the delivery. The end faces of the rotors which contact with the casing walls are so "shaped as to generate, when said rotors are rotated, convexed cones Whose axes coincide with the center line of the rotor axes and whose generating lines have apices at spaced points on the rotor axes and are inclined towards each other at a slight angle from ay radial line. The inner faces of the casing walls are also constructed as cones having axes which coincide with that of the rotating shaft, the cones nearly conforming to those of the end faces of the rotor 3 so that these two sets of cones are perfectly fitted. At the tip 9 and sides of eachof the teeth 4L there is provided a deep guide groove into which the slider or blade 10 conforming to the shape of the groove is slidably fitted, the end faces 8 of the'- blades 1 which contact with the casing walls beingso' sloped as to coincide with the inclination of cone of the end faces of rotors and also with that of inner faces. At the bottom of the guide groove, there are provided one or more holes 11, in each of which a spiral spring 12 isv'arranged. Therefore, when lthe pump works, the blade or slider 10 is notonly projected out by the centrifu- 3, but also it is slight angle from a radial line, for the gal force caused by the rotation of the rotor pushed 'outward by these splral springs. T erefore the tip and sides of the slider are' respectively tightly fitted to the drum 1r and the casing wall 2 of the pump. It will be understood that by such construction of the blades as above described, they make better contact b reason of their wedge like shape althoug some wear in the run of working of the pump, or some manufactural errors in the form ofI the` parts, any gap, between the pump drum, the end covers and the surface of the rotor created by such Wear or errors, is entirely and automaticallyy diminished so that air, water or any other fluids, is perfectly prevented from leaking out of the gap and accordingly the efficiency of the pump 1s remarkably increased. The invention may also be applied to any type of the rotary pumps other than the geared type asI exemplified.

Claims: l

1. An improved geared pump comprising a casing, casing walls, a palr of rotors, teeth on each of said rotors, blades outwardly slidably mounted on each of the teeth, the end faces of the blades which contact with the casing walls being so sloped as to generate when said rotors are rotated convex cones Whose axes coincide with the center line of the rotor axis and whose generating lines have apices at a spaced point on the rotor axis and are inclined toward each other at a pose specified.

2.' An improved geared pump comprising a casing, casing walls, a pair of rotors, teeth on each of said rotors, deep guide grooves of inverted channel shape in the tips and sides of said teeth parallel with the axes of said rotors, and blades slidably mounted in said grooves, the end faces of said blades which contact with the casing walls being so sloped when the saidroto'rs are rotated as to generate convexed cones whose axis coincide with the center line of the rotor axis, and whose generating lines have apices at spaced points on the rotor axis and are inclined toward each other at a slightvangle from a radial line, for the purpose specified.

3. An improved geared pump comprising a casing, casing walls, a vpair of rotors, the end faces of the rotors which contact with the easing walls being formed as cones whose axes coincide with the center line of the rothere may be pur- UNITED STATES 'PATENT' OFFICE.

tor axis, and whose generating lines have apices at spaced points on therotor axis and are4 inclined toward each other at a slight angle from a radial line, teeth on each ofu said rotors, deep guide groovesof iny verted channel shape in the ti s and sides of the said teeth and blades sli ably mounted in the grooves, the end faces of each blade being so sloped as to coincide with the inclination of the cones of the inner faces of the casing walls, for'the purpose specified.

4. An improved geared pump comprising a casin a pair o rotating shafts, casing walls, t e'inner surfaces` of the casin walls `which contact with the end :faces o rotor o of the rotors which contact withthe inner faces of the casing Walls being formed as concaved cones to tightly contact with the inner faces of the casingwalls, teeth on each of said'rotors, deep guide grooves of inverted channel shape in the ti'ps and sides of the said teeth arallelwith the axes of said rotors .and lades of wedge shape slidably mounted in the grooves, the' end facesof each blade beingI so sloped as to coincide with the inclination of t e cones ofthe inner faces of the casing walls, for the purpose specied.

5. An improved geared pump comprising a casing, a pair of ,rotatingv shafts, casing walls, the inner surfaces of the casing walls which contact with the end faces of rotor and blades being formed as concaved cones,

whose axes coincide with the center line of 4.0

the rotating shaft and whose generating lines have lapices at spaced points on the axis 'of the rotating shaft, a pair of rotors mounted on the rotating shafts, the end faces of the rotors which contact with the 45 inner faces of the casin walls being formed .Y

as concaved cones to tig tly contact with the inner faces of the casing walls, teeth on each of said rotors, deep guide grooves of linverted channel shape in the tips and sides of the l` said teeth, blades slidably niounted in the grooves, the end face of each blade beingr so sloped as to coincide with the inclination f of the cones of the inner faces of the casing walls, openings in nthe bottom of said grooves and springs in said openings for pressing siaif bladesv outwardly, for the purpose spec- 1A e Y In testimony whereof I aix mv signature'.

i l sHosAKU ls'ioRrrA.A 

